LXR linux/drivers/gpu/drm/i915/gem/i915

   1/*
   2 * SPDX-License-Identifier: MIT
   3 *
   4 * Copyright © 2017 Intel Corporation
   5 */
   6
   7#include <linux/fs.h>
   8#include <linux/mount.h>
   9#include <linux/pagemap.h>
  10
  11#include "i915_drv.h"
  12#include "i915_gemfs.h"
  13
  14int i915_gemfs_init(struct drm_i915_private *i915)
  15{
  16        struct file_system_type *type;
  17        struct vfsmount *gemfs;
  18
  19        type = get_fs_type("tmpfs");
  20        if (!type)
  21                return -ENODEV;
  22
  23        /*
  24         * By creating our own shmemfs mountpoint, we can pass in
  25         * mount flags that better match our usecase.
  26         *
  27         * One example, although it is probably better with a per-file
  28         * control, is selecting huge page allocations ("huge=within_size").
  29         * Currently unused due to bandwidth issues (slow reads) on Broadwell+.
  30         */
  31
  32        gemfs = kern_mount(type);
  33        if (IS_ERR(gemfs))
  34                return PTR_ERR(gemfs);
  35
  36        i915->mm.gemfs = gemfs;
  37
  38        return 0;
  39}
  40
  41void i915_gemfs_fini(struct drm_i915_private *i915)
  42{
  43        kern_unmount(i915->mm.gemfs);
  44}
  45